Precision Nucleon-Nucleon Potential at Fifth Order in the Chiral Expansion
Precision Nucleon-Nucleon Potential at Fifth Order in the Chiral Expansion
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DOI：
10.1103/physrevlett.115.122301
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发表时间：
2015-09-17
影响因子：
8.6
通讯作者：
Meissner, U. -G.
中科院分区：
文献类型：
--
作者：
Epelbaum, E.;Krebs, H.;Meissner, U. -G.
在手性有效场论中提出了五阶核子-核子势。与利用坐标空间正则化的四阶结果相比，我们发现核子-核子相移的描述有了实质性的改进。这为相应的双介子交换贡献提供了明确的证据，所有低能常数都是由介子-核子散射确定的。核子-核子观测值的五阶修正似乎具有自然大小，这证实了核力的手性扩展具有良好的收敛性。此外，所得结果为作者提出的量化手性展开截断引起的理论不确定度的新方法提供了有力的支持。我们的工作为在少核子和多核子系统中精确从头计算开辟了新的视角，尤其与正在进行的手性有效场论框架中对三核子力结构的定量理解有关。
We present a nucleon-nucleon potential at fifth order in chiral effective field theory. We find a substantial improvement in the description of nucleon-nucleon phase shifts as compared to the fourth-order results utilizing a coordinate-space regularization. This provides clear evidence of the corresponding two-pion exchange contributions with all low-energy constants being determined from pion-nucleon scattering. The fifth-order corrections to nucleon-nucleon observables appear to be of a natural size, which confirms the good convergence of the chiral expansion for nuclear forces. Furthermore, the obtained results provide strong support for the novel way of quantifying the theoretical uncertainty due to the truncation of the chiral expansion proposed by the authors. Our work opens up new perspectives for precision ab initio calculations in few-and many-nucleon systems and is especially relevant for ongoing efforts towards a quantitative understanding of the structure of the three-nucleon force in the framework of chiral effective field theory.